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Subject: VIRTIO RPMB Front End drivers for Linux
Hi, I'm currently working on a vhost-user backend for virto-rpmb as defined in the draft version of the OASIS spec (since 8c6acac2). I'm developing it within the QEMU source tree but it is intended to be a portable vhost-user binary with minimal POSIX like dependencies. Part of the aim of the project is to experiment with a vhost-user backend that has minimal access to guest memory and RPMB makes sense as the vhost-user daemon only really needs to see the virt queues to pass the data back and forth. One eventual architecture would be to move the vhost-user driver into it's own isolated VM with only minimal memory sharing between the guest and it's back-end. I've gotten enough of the plumbing working now that I'm ready to start implementing the RPMB spec itself. I've been looking for a front-end to use in testing and I found the Linux driver sitting in Project ACRN's guest kernel fork. With this kernel and VIRTIO_ID_RPMB tweaked to the standard based one I get far enough that the driver is initialised before my drivers falls over when an un-handled feature is requested (0x130000000). This is slightly confusing because the spec doesn't define any feature bits. So a few questions: - how divergent is the virtio-rpmb front/back-end in ACRN from the OASIS spec? - is there likely to be another submission to the upstream kernel? I've also read the document on the ACRN website which talks about the secure architecture: https://projectacrn.github.io/latest/tutorials/trustyACRN.html I was wondering if there was any low level usage information. From looking at the Kconfig options it seems the virtio-rpmb driver interfaces with a wider RPMB sub-system which exposes a character device to the kernels user-space. So: - are there any special user-space tools to use this interface? - is there a write-up somewhere of how to exercise the interface or any sort of test suite? Thanks in advance, -- Alex BennÃe
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